Increasing the pool of candidates and voter turnout are important goals.
In a way it makes sense that Juducial and special elections have lower turnout than Delegate elections. It mirrors RL, at least in the US, where mid-term elections consistently have low voter turnout, and candidates at the local level often run unchallenged. One would expect uncontested races to spark less interest among voters. An exciting race, where an individual's vote really can make a difference, should produce a higher turnout. The candidates themselves often do the job of getting out the vote. So, voter turnout can be largely dependent on having two or more strong candidates in a race.
Now, how do we get more candidates to run? Special elections are challenging since they are largely unplanned. People have already committed to other responsibilities. But nominations from one's peers often works, as do PMs, IRC chats and other less formal means of encouragement. A more developed Party system could also ensure a full slate, though it would come with a different set of challenges..
As for the visibility of the Elections subforum, I am not convinced folks have trouble finding it now. I am sure it will be easier to find if it is a top-level forum. But I think I may get confused if it starts moving around. Like my phone, keys, TV remote... hey, I'm old; it happens. It might not be a problem for everyone else.
Anyway, this is the kind of tweak we could try, and if it doesn't work we can try something else. Like a big red neon flashing sign. A marching band. Dancing girls.